C#

hwinsta = OpenWindowStation("WinSta0", false, WINDOWS_STATION_ACCESS_MASK.WINSTA_ALL_ACCESS);
           hwinsta2 = SetProcessWindowStation(hwinsta);
           hdesk = OpenDesktop("MyNewDesktop", 0, false, DESKTOP_ACCESS_MASK.GENERIC_ALL);//0x0001L | SetThreadDesktop);
           bool thset = SetThreadDesktop(hdesk);

           EnumDelegate delEnumfunc = new EnumDelegate(EnumWindowsProc);
           IntPtr DesktopWindow = GetDesktopWindow();
           bool bSuccessful = EnumDesktopWindows(hdesk, delEnumfunc, DesktopWindow);
           if (bSuccessful) // this was sucessfull control enters this block
           {
               string filename = string.Format("ScreenCap-{0:yyyy-MM-dd_hh-mm-ss-tt}", DateTime.Now);
               var bounds = Screen.GetBounds(Point.Empty);
               using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))
               {
                   using (Graphics g = Graphics.FromImage(bitmap))
                   {
                       g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
                   }
                   bitmap.Save(@"C:\" + filename + ".jpg", ImageFormat.Jpeg);
               }
            }
            else
            {
            // Get the last Win32 error code
                int nErrorCode = Marshal.GetLastWin32Error();
                string strErrMsg = String.Format("EnumDesktopWindows failed with code {0}.", nErrorCode);
                throw new Exception(strErrMsg);
           }